Welcome to Saint Catherine's Church, known in French as Église Sainte-Catherine and in Dutch as Sint-Katelijnekerk. You are in the heart of Brussels, on the square that carries the saint's name, in the district people call the Quays. Look up and you will see a vast church of dark blue stone with powerful buttresses and gargoyles, and a curious Italian-looking bell tower standing beside the entrance. Here is the first surprise. You are standing where ships once docked. This church was built on the site of a basin of the former Port of Brussels. Those who know the city only as a place of squares and chocolate shops might not guess that the water came this far in, but the church and the square around it are a legacy of that maritime past. Over the next few minutes we will follow the church from a modest medieval chapel to a nineteenth-century landmark. We will look at its architecture, at the compromise behind its design, and at the tower that survived when the old church did not. Getting here is easy, as the Sainte-Catherine metro station, on lines one and five, is right by the square.